Double-acting load brake



May 29, 1923. 1,457,162

W. E. HALE DOUBLE ACTING LOAD BRAKE Filed April 20. 1921 2 Sheets-Sheet l l l l l G Q mm@ s V fm 7.@ @myZ-(HM fwwf/ M May 29, 1923.

1,457,162 W. E. HALE DOUBLE ACTING LOAD BRAKE Filed April 20. 1921 2 Sheets-Sheet 2 A m Patented May 29, 1923,

vniv-rr no STATES- or y:eEI\INsYLvANIA., g f

. 1,457,162 32A-Tis Nr @En CE?,

WILLIAM E. nnLnorrorv'r wesnINGJ-ION, PENNSYLVANIA, kAssIerNontrionfi-I.' BEAuMoNr CQMPANY, orrnrriannrrnm. PENNSYLVANIA, A C ORPORAIIQN I f neuste-.ACTING lImre Viiaarni",

Applicationled April 20, `1921. Serial vNo. 463,012. f

To cZZffw-wm/t mayconcern:v

Be it known-"that l, WILLIAM E.' HALE,

a Acitizen ofthe 'United- States, residing inA Fort Washington,- Montgomery County, Pennsylvania, have inventedeertain Im- `prfoneinents 'in Double-Acting Load Brakes,l

of whichthe following is a specication, My invention relates to certain improvements hoisting mechanism, particularly of :the-type used in operatinga-skip hoist in which a bucket' is raised-and loweredthrough the medium lof a drum operated by a reversibleniotor, Aor other-means.'

' One object of he invention 1s `toprov-ide. mechanism for vpreventing a heavy load` from running away when beingl raised.'

'AY further object ofthe invention is. tol

' provide meansby which' the frictionl mechanism is automatically operatedgwherebythe movement of thed'rum.V can be reversed `on the. reversal o-f the motor, the load being prevented yfrom slipping duringE or after the Shifting operation.

These objects-I vattain inthe followingr manner, reference being.v had 'to the accompanying drawings, in which: Fig. l is a. plan view showing lmy nnproved mechanism inprelation tov a driving motor and a rope drum; A F ig: 21"is-a.-,sectional- View on the line 2 2, Fig. l; Fig. 3 is a sectional view on the line 3 3, Fig. 2;

Fig. 4 is a sectional view on the line H, Fig. 2; y

Fig. 5 is a perspective view of one of the pawls; and

Fig. 6 is a detached sectional view of the friction disks.

l is a motor, and, in the present instance, I have shown an electric motor.` On the motor shaft 2 is a pinion 3, which meshes f with the gear wheel 4 mounted on the shaft 5. This shaft is adapted to a bearing 6 in a frame 7 of any suitable construction. The

shaft has screw threads 8, and, in the hub ofy the gear wheel 4 is an internal thread .which meshes with the screw 8 so that, when vthe gear wheel 4 is turned in one direction, it will be moved laterally` by the screw thread 8 towards one side and, when the direction of movement is reversed, it will be vmoved towards the opposite side. the hub of the gear wheel 4 are two fric- Arope n the drum and the other rope leading Mounted on of the Jgear wheel-'4jai-rel frictionvdisks ll I and 11a. -vBothof these disksarefke'yed to the shaft, as shown, so-'that-theymust turn the shaft whenv the-disks 9, 9a are in. frictional contact with 'the' friction -d-isks and with thev gear'wh'eel v4. Alsofkeyed to the shaft is apinion 12, which meshes with a gear wheel 131,011 a' shaft '14 on which? is mounted fahoisting drum 15. 'Two .ropes-l 16' and 17 arecoiled onA ithis drum, one

leading off from one side off .from the other,v side of-the drum so that when a bucket, or other weight, is

attached to 'one rope and when the -mecha-v nisrnv is adjusted'so that this bucket will be raised,the`other bucket, which is in the@ raised` position, is flowered. Engaging the ratchet teeth en the 'friction-l disk 1l .are

pawls- 1:8.an-dv 19, which are pivoted respectively .at 20 and l21 tofblo'cks 22,4which are mounted on rods 23,23 carried by theframe 7, F1g.4, vandthey `are connected by bolts 24 on which are'springs :25, tending to draw the` two yblocks Vtowardsy each other. The

pressure can be regulated byadjusting the nutson the rod. VIn thepresent instance,

there are'two-,pawls at veach side of the wheel and both sets of pawls are in engagement at all times with their respective disks. f

The operationiis asy follows: When it is wished to raise a bucket attached to one rope,y then the motor l is turned in the direction of the arrow, li ment will cause'the vgear wheel 4 to move in the direction of its arrow and the screw thread 8' will force thiswheel lin contactwith the ratchet disk 9a and towards the friction disk lland, as the wheel continues .to revolve, the pressure'will4 be sufficient to cause the friction disk to be turned and with it the shaft 5. As l,the pinion 12 .issecured wind one rope, -while the other is being unwound. When the motor is reversed, the motor shaft 2is turned the opposite direction "and the gear wheel 4 -is withdrawn friction disk 11a and movedv towardsthe ratchet disk V9 and friction` disk 11. When ig. l. This movei 1U() i to this shaft, it will turn the ydrum and will-j 1 .105" from contact with the ratchet disk 9a and disk 9, owing to the engagement of its teeth by the pawls,

lf the load should rotate the gear wheel l2, the gear wheel will turn the shaft, and its screw will cause the gear Wheel Il' to force either the friction disk l() or l0a against' the friction disks ll, ll, and, as

the pawl holds the disks l0, 10?y from rotati ng in one direction, the load is prevented from' ruiming away with the mechanism.

It will be understood that in` some instances toothed chains and sprocket wheels may bev substituted for the gear wheel shown.

I claim:`

l. The combination in hoisting mechanism,

of a power shaft; an'intermediate-shaft; a-

driven shaft; a drum thereon arranged to have two ropes wound thereon, one leading from one side of the drum and the other leading from. the opposite side thereof; an

intermediate shaft having a screw thread; a wheel on the said shaft driven from the power shaft and having an internal thread' in itsihub meshing with the thread on the intermediate shaft; two friction disks keyed to the'said shaft, one on eachv side of the wheel; ratchet disks on each'side of the wheelvlocated between the wheel and the friction disks; pawls engaging the ratchet wheel is reversed, it will be moved into frictional contact with the other disks, causing the shaft to move in the opposite direction; and means connecting the shaft with the drum shaft so that the Vdrum shaft will be reversed with the intermediate shaft, the pawls preventing vthe load running away withv the mechanism. Y

l 2. Thecombination of a power shaft; a drum shaft; a drum thereon; an intermediate shaft; a gear through which the drum shaft is driven from the intermediate shaft; a pinion on the power shaft; a gear wheel on the intermediate shaft; said intermediate shaft having a screw thread thereon, a hub of the gear wheel having a vthread meshing with the thread ofthe intermediate shaft; two friction disks, one on each side of the said gearfwheel, said disks being secured to the intermediate shaft; a ratchet disk loosely mounted between the gear wheeland eachk friction disk andhaving ratchet teeth thereon; pawls engaging the ratchet teeth, the teethof one ratchet disk being set opposite to the teeth of the other ratchet disk and in such relation to the movement of the gear wheel that when the said gear wheel is turned in one direction it will be moved towards one friction `disk and will turnl the shaft through said disk; .and pawls prevent-k ing the shaft turningin the 'opposite directlon in lorder to prevent the racing of the shaft, due to excessive load. i

WILLIAM E. HALE. 

